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Drugs Used to Manage Urinary Incontinence in Dogs & Cats

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Drugs Used to Manage Urinary Incontinence in Dogs & Cats PLUMB’S THERAPEUTICS BRIEF h Rx SOLUTIONS h PEER REVIEWED ChronicDrugs UpperUsed to Respiratory Manage UrinaryTract Disease Incontinence in a Cat in Dogs & Cats Margie Scherk, DVM, DABVP (Feline) catsiNK Julie KathleenVancouver, Byron, BC, DVM, Canada MS, DACVIM The Ohio State University REDLIGHT GREEN LIGHT h PEER REVIEWED Urinary incontinence is a common presenting complaint primar- Following are therapeutic targets for the various causes of ily affecting dogs and occasionally cats. The most common incontinence. cause of urinary incontinence is urethral sphincter mechanism incompetence (USMI), which typically affects spayed female DRUGS TO MANAGE STORAGE DISORDERS dogs and occasionally male dogs. Other causes include disor- a-Adrenergic Drug ders such as urine retention and bladder outflow obstruction, Phenylpropanolamine which are more common in male dogs. Phenylpropanolamine is a nonselective a-agonist that also has some β-agonist effects. It indirectly increases urethral smooth Therapeutic objectives include treating signs of incontinence- muscle tone and may also induce relaxation of the detrusor mus- related disorders such as storage disorders (eg, USMI, ectopic cle via β-adrenergic effects. Its nonselectivity may lead to stimu- ureter, overactive bladder) and emptying disorders (eg, lation of vasoconstriction and overall sympathetic activation. detrusor-urethral dyssynergia, functional obstruction, ure- throspasm, detrusor atony, neurogenic upper motor neuron Formulation → Oral bladder). Goals for treating storage disorders include increas- ing urethral sphincter smooth and striated muscle tone, Dose (dogs, cats) → 1-2 mg/kg PO q8-12h1 increasing bladder compliance, and decreasing intravesicular pressures during filling and storage. Goals for treating empty- Key Points ing disorders include decreasing urethral sphincter smooth h Dose escalation or increased frequency over time may be and striated muscle tone, increasing detrusor contraction, and necessary. reducing postvoid residual volume. USMI = urethral sphincter mechanism incompetence December 2017 Plumb’s Therapeutics Brief 53 PLUMB’S THERAPEUTICS BRIEF h Rx SOLUTIONS h PEER REVIEWED h Adverse effects include hypertension, restlessness, Diethylstilbestrol decreased appetite, and aggression.2 Diethylstilbestrol is a potent, synthetic, nonsteroidal estrogen h Should be used with caution in patients that are predisposed that improves continence by increasing the number and to hypertension because of comorbid conditions (eg, kidney sensitivity of a-receptors in the urethral smooth muscle. It disease, hyperadrenocorticism, hyperthyroidism)3 has a trophic effect on periurethral tissues and vasculature. h May increase agitation in patients with anxiety disorders Formulation → Not commercially available; must be compounded Estrogens Estriol Dose (dogs only) → 0.5-1.0 mg/dog PO q24h for 3 to 5 days, Estriol is a naturally occurring estrogen with affinity for both then q7d1 types of estrogen receptors. It can improve continence by Administration interval should be titrated to effect.1 increasing the number and sensitivity of a-receptors in the urethral smooth muscle, and it has a trophic effect on peri- Key Points 4 urethral tissues and vasculature. h Reported efficacy of approximately 65% complete and 23% improved continence in female dogs6 Formulation → Oral h Although estrogens can lead to bone marrow suppression, this has not been reported at recommended doses.7 Dose (dogs only) → 2 mg/dog PO q24h for 14 days, then reduce h Adverse effects include vulvar or mammary swelling, attrac- in 0.5-mg increments q7d to lowest effective dose1 tiveness to males, lethargy, vomiting, and diarrhea. • Most patients respond to dose reduction. Key Points h Should not be used in intact females h Efficacy in female dogs reported as 82% to 92% improved h Use in males may lead to prostatic metaplasia. 5 or complete continence h Overdose can lead to bone marrow suppression. h Although estrogens can lead to bone marrow suppression, h Should not be used in cats this effect has not been reported when this drug is used at the recommended doses. Tricyclic Antidepressant h Adverse effects include vulvar or mammary swelling, Imipramine attractiveness to males, lethargy, vomiting, and diarrhea. Imipramine is a norepinephrine reuptake inhibitor and poten- • Most patients respond to dose reduction. tial anticholinergic that indirectly increases a-receptor stimu- h Should not be used in intact females lation in the urethral smooth muscle. This drug may increase h Use in males may lead to prostatic metaplasia. bladder relaxation. h Overdose can lead to bone marrow suppression. h Should not be used in cats Formulation → Oral Dose (dogs) → 5-15 mg/dog PO q12h1 Dose (cats) → 2.5-5 mg/cat PO q12h1 Key Points Diethylstilbestrol use h Imipramine has complex mechanisms of action and appears in males may lead to to act through both stimulation of the sympathetic nervous system and inhibition of the parasympathetic nervous system. prostatic metaplasia. h Evidence of efficacy in the treatment of urinary storage disorders in dogs and cats is lacking. • Rationale for use is extrapolated from in vitro studies and clinical evidence of the drug’s effect in humans and healthy USMI = urethral sphincter mechanism incompetence dogs. 54 Plumb’s Therapeutics Brief December 2017 h Adverse effects include vomiting, diarrhea, hyperexcitability, • Treatment should be repeated as needed when clinical seizure, and sedation. signs return. h May lower seizure threshold in epileptic patients h Most commonly used to treat endocrine diseases in ferrets h Should not be coadministered with monoamine oxidase and suppress egg formation in birds inhibitors h Little is known about adverse effects in dogs and cats. Testosterone Analog Antimuscarinic & Spasmolytic Drugs Testosterone Cypionate Oxybutynin Testosterone is thought to improve urethral smooth muscle tone; Oxybutynin has direct antimuscarinic effects on the smooth however, evidence of the mechanism and its efficacy in the treat- muscle of the bladder without affecting the smooth muscle of ment of urinary tract disorders in dogs and cats is lacking. the vasculature. Formulation → Parenteral for IM injection Formulation → Oral Dose (dogs only) → 2.2 mg/kg IM q30-60d1 Dose (dogs) → 0.2 mg/kg PO q8-12h or 1.25-3.75 mg/dog PO q8-12h1 Key Points Dose (cats; extra-label) → 0.5-1.25 mg/cat PO q8-12h1 h Anecdotally considered to be less effective than phenylpro- panolamine in male dogs with USMI Key Points h Adverse effects include perianal adenoma and prostate h Primarily used in cases of suspected overactive bladder or enlargement in male patients and clitoral hypertrophy, detrusor instability masculinization, and aggression in female patients. h Also acts as an antispasmodic and reduces maximum filling h Should not be used in patients with prostatic carcinoma and and emptying bladder pressures11 should be used with caution in patients with renal, cardiac, h Adverse effects include diarrhea, constipation, hypersaliva- or hepatic disease tion, urine retention, and sedation. h May decrease insulin needs in diabetic patients1 h Use with other sedatives may increase effect. h Should be used with caution in patients with hypotension Gonadotropin-Releasing Hormone (GnRH) Analog Leuprolide Acetate Propantheline Leuprolide acetate is a GnRH analog that suppresses both Propantheline is an antimuscarinic agent that has effects on the follicle-stimulating hormone and luteinizing hormone increases smooth muscle of the bladder and may reduce spasm related to after ovariohysterectomy in dogs. Some evidence shows that detrusor hyperreflexia and associated urinary incontinence. the alteration of these hormones may play a larger role in USMI development as compared with a change in estrogen levels.8 Formulation → Oral; injectable form available in Australia This drug does not appear to affect urethral pressures but can improve bladder relaxation and compliance.9,10 Dose (dogs) → 7.5-30 mg/dog PO q8-24h1 Dose (cats) → 5-7.5 mg/cat PO q8-72h; lowest effective dose Formulation → Depot injection should be used1 Immediate-release form should be avoided. Key Points Dose (dogs) → 20-30 mg IM q3mo10 h Variable absorption of the oral formulation in small animals; Doses are extrapolated from the literature.10 No standard dose must be adjusted for each patient. dose regimen has been established. h Should not be used if urinary obstruction or urine retention is suspected Key Points h Adverse effects include dry mouth, tachycardia, ileus, and con- h Effects may last longer than 3 months. stipation; vomiting and hypersalivation may be seen in cats.1 December 2017 Plumb’s Therapeutics Brief 55 PLUMB’S THERAPEUTICS BRIEF h Rx SOLUTIONS h PEER REVIEWED DRUGS TO MANAGE EMPTYING DISORDERS h Oral bioavailability in dogs is about one-third of that in a-Adrenergic Blocking Drugs humans.17 & Smooth Muscle Relaxants • Bioavailability may be increased when administered on an Prazosin empty stomach. h Prazosin is a nonselective a1-inhibitor used to block a-receptors May take several days for effect in the urethral smooth muscle and treat functional urethral h High doses may lead to hypotension. obstruction.12 h Sustained-release formulations should not be crushed. Formulation → Oral Phenoxybenzamine Phenoxybenzamine is a pure a-adrenergic blocker used to Dose (dogs) → 1 mg/dog PO q8-12h for dogs weighing <15 kg; reduce urethral pressures and treat hypertension. 2 mg/dog PO q8-12h for dogs weighing >15 kg1 Dose (cats) → 0.25-1
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